Today's Message Index:
----------------------
1. 06:10 AM - Re: SWR Meter OOPS (Robert Borger)
2. 07:41 AM - Re: SWR Meter OOPS (ROGER & JEAN CURTIS)
3. 07:46 AM - Re: SWR Meter OOPS (Robert L. Nuckolls, III)
4. 07:50 AM - 28 to 12v down-converter (Robert L. Nuckolls, III)
5. 07:55 AM - Re: Re: Weak and Static on Transmission (Robert L. Nuckolls, III)
6. 08:46 AM - Re: SWR Meter OOPS (ROGER & JEAN CURTIS)
7. 08:52 AM - Re: SWR Meter OOPS (Robert Borger)
8. 10:00 AM - Re: SWR Meter OOPS (Robert L. Nuckolls, III)
9. 10:54 AM - Re: Re: Weak and Static on Transmission (Noel Loveys)
10. 11:12 AM - really cheap relay deck; was 28 to 12v down-converter (Charlie England)
11. 12:01 PM - Re: Re: Weak and Static on Transmission (Bill Bradburry)
12. 12:26 PM - Re: 28 to 12v down-converter (Paul Millner)
13. 02:15 PM - Re: Re: Weak and Static on Transmission (Noel Loveys)
14. 03:42 PM - Re: Re: Weak and Static on Transmission (Bill Bradburry)
15. 10:48 PM - Re: Grand rapids cs02 / cs01 amp sensor (chris Sinfield)
Message 1
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| Subject: | Re: SWR Meter OOPS |
Bob,
WRT the SW DIGITAL SWR METER shown below.
It looks like a pretty cool little device that anyone could have in their OBAM
tool kit. And there are sure bunches of them for sale on e-bay.
It appears to have threaded (TNC?) connections. Would one make up short lengths
of BNC to TNC coax to connect it into the antenna line? Or are there BNC/TNC
adaptors that are more appropriate?
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop.
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger@mac.com
On Jan 21, 2012, at 4:41 PM, Robert L. Nuckolls, III wrote:
> You need something
> tailored to VHF to do any serious work with your ship's
> antennas. Something like this
>
> which can be had for about $60 off eBay. It's optimized
> for VHF and will produce more useful readings.
Message 2
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You need something
tailored to VHF to do any serious work with your ship's
antennas. Something like this
which can be had for about $60 off eBay. It's optimized
for VHF and will produce more useful readings.
I noticed on Ebay that these come in
several different flavors, various power output, and some specific to a
particular radio.
For our OBAM purpose, are there any specs to
adhere to, other than VHF band?
Thanks,
Roger
Message 3
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| Subject: | Re: SWR Meter OOPS |
At 08:06 AM 1/22/2012, you wrote:
>Bob,
>
>WRT the SW DIGITAL SWR METER shown below.
>
>It looks like a pretty cool little device that anyone could have in
>their OBAM tool kit. And there are sure bunches of them for sale on e-bay.
>
>It appears to have threaded (TNC?) connections. Would one make up
>short lengths of BNC to TNC coax to connect it into the antenna
>line? Or are there BNC/TNC adaptors that are more appropriate?
Those are type N connectors. You'll want some
N-male/BNC-female adapters to make the transition
to connectors popular with the aircraft world.
Emacs!
I have a Bird 43 and don't need one of these for
my own purposes but I would like to put my hands
on one to compare with the Bird. As a teacher
it is always good to be able to say, "been there,
done that."
So Roger my friend, here's a plan. I'll order
one of these along with the requisite adapters.
I'll fabricate a BNC-BNC jumper cable that facilitates
the insertion of the instrument into your transmitter's
coax feeder. I'll compare the device with my
Bird 43 and report the findings to the List.
Then I'll offer you the test article and
accessories for what I have in them + postage.
Sounds like a deal to me . . . what say you sir?
Bob . . .
Message 4
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| Subject: | 28 to 12v down-converter |
A short time ago we were discussing options for
adding some 12-14 accessories to a 28v airplane.
I think the author of the thread was also interested
in having some 'cigar lighter' jacks for the odd
appliance.
Here's a device I ran across on eBay . . .
http://tinyurl.com/7phxaoy
Of course there are bumps and potholes in the translation
of specifications into English but for the most part, this
device seems a likely candidate. It features both
output voltage and current limit adjustments. This makes
it suitable for the task and even somewhat idiot proof
in that it's self protecting in case of a short circuit
or overload.
Of course, compatibility with respect to radio noise is
unknown but I've never met a noise problem I couldn't
whip.
Food for thought.
Bob . . .
Message 5
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| Subject: | Re: Weak and Static on Transmission |
At 07:38 AM 1/20/2012, you wrote:
><bbradburry@bellsouth.net>
>
>Well, to further clarify this problem. I seem to be able to hear ok on the
>ground while taxiing around the airport, but after I leave the airport the
>reception gets really bad. At first I thought it was a problem with the
>approach frequency because that is where it would first start up. It was a
>loud hiss in the headphones so loud that I could not hear ATC. In fact, I
>have made two NORDO landings as a result on this loud hiss. I sent my radio
>back to have it checked out and nothing was found. All this trouble is at
>below 5000 ft and fine weather. I am flying off my 40 hours (22 so far) and
>am only flying in good weather. These radio problems at a Class C airport
>have made me afraid to fly. ATC could take some action against me if it
>continues.
This is the first time I've been aware that you were having
problems both with hearing and talking. While the ground
listeners complain of "static" you have described the extraneous
audio as a "hiss". We may be talking of two different problems.
I'm having trouble resolving a single noise source that would
manifest in both what you hear and what is transmitted to the
ground.
Get a hand-held transceiver and use it to 'probe' around
the airplane. Use tune the hand-held to an unused frequency,
open the squelch and open the volume to get a low level of
no-signal hiss common to all receivers. Then probe around
the panel mounted goodies and wire harnesses with the
hand-held's antenna. See if the no-signal hiss changes
in level with the master switch on versus off. If it does
change, turn off accessories and/or pull breakers/fuses to
see if any one accessory produces a noticeable change
in noise from the hand-held.
You can use the hand-held as an airborne signal quality
sniffer too. Use a headset with the hand held to listen
to your own transmitted signals. You may have to take the
antenna off the hand-held to avoid overloading the hand-held
receiver. You don't need to talk on the ship's radio, just
listen to your transmitted signal to characterize the noise.
Is it the same "hiss" you hear in your received signals?
In any case, carry the hand held to avoid the no-radio
return to the airport. In fact, having the 'three musketeers
of dark-panel ops' in your flight bag is good insurance
for any flights:
www.aeroelectric.com/Pictures/Misc/Failure_Tolerance.pdf
It was also suggested that you try a substitute antenna.
I've fabricated test antennas that could be taped to the
top or bottom surface of a wing and coax brought into
the cockpit through the door gasket or some other pathway.
But using the hand-held to characterize your transmitted
and received signals personally takes ATC and others
out of the loop. This is an especially good thing when
they're unable/unwilling to join the discussion and
offer their own observations/insights.
Bob . . .
Message 6
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So Roger my friend, here's a plan. I'll order
one of these along with the requisite adapters.
I'll fabricate a BNC-BNC jumper cable that facilitates
the insertion of the instrument into your transmitter's
coax feeder. I'll compare the device with my
Bird 43 and report the findings to the List.
Then I'll offer you the test article and
accessories for what I have in them + postage.
Sounds like a deal to me . . . what say you sir?
Bob . . .
Sounds like a deal to me, go for it.
When everything is complete you can package
it up with the gooseneck light and ship it all together. I'm not in a
rush,
so if you can do it in the next 3 or 4 months, that would be great.
Roger
Message 7
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| Subject: | Re: SWR Meter OOPS |
Bob,
You got a deal!
Let me know how much when you are ready to ship and I'll have a check in the mail
that day.
Blue skies & tailwinds,
Bob Borger
Europa XS Tri, Rotax 914, Airmaster C/S Prop.
Little Toot Sport Biplane, Lycoming Thunderbolt AEIO-320 EXP
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger@mac.com
On Jan 22, 2012, at 9:36 AM, Robert L. Nuckolls, III wrote:
> At 08:06 AM 1/22/2012, you wrote:
>> Bob,
>>
>> WRT the SW DIGITAL SWR METER shown below.
>>
>> It looks like a pretty cool little device that anyone could have in their OBAM
tool kit. And there are sure bunches of them for sale on e-bay.
>>
>> It appears to have threaded (TNC?) connections. Would one make up short lengths
of BNC to TNC coax to connect it into the antenna line? Or are there BNC/TNC
adaptors that are more appropriate?
>
> Those are type N connectors. You'll want some
> N-male/BNC-female adapters to make the transition
> to connectors popular with the aircraft world.
>
> <15f453f4.jpg>
>
>
> I have a Bird 43 and don't need one of these for
> my own purposes but I would like to put my hands
> on one to compare with the Bird. As a teacher
> it is always good to be able to say, "been there,
> done that."
>
> So Roger my friend, here's a plan. I'll order
> one of these along with the requisite adapters.
> I'll fabricate a BNC-BNC jumper cable that facilitates
> the insertion of the instrument into your transmitter's
> coax feeder. I'll compare the device with my
> Bird 43 and report the findings to the List.
>
> Then I'll offer you the test article and
> accessories for what I have in them + postage.
> Sounds like a deal to me . . . what say you sir?
>
>
> Bob . . .
>
Message 8
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>Sounds like a deal to me, go for it.
It shall be done.
Bob . . .
Message 9
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| Subject: | Re: Weak and Static on Transmission |
Do you get the same static when you return from a flight? Does the hiss go
away as the engine cools down?
Noel
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Bill
Bradburry
Sent: January 20, 2012 10:08 AM
Subject: RE: AeroElectric-List: Re: Weak and Static on Transmission
<bbradburry@bellsouth.net>
Well, to further clarify this problem. I seem to be able to hear ok on the
ground while taxiing around the airport, but after I leave the airport the
reception gets really bad. At first I thought it was a problem with the
approach frequency because that is where it would first start up. It was a
loud hiss in the headphones so loud that I could not hear ATC. In fact, I
have made two NORDO landings as a result on this loud hiss. I sent my radio
back to have it checked out and nothing was found. All this trouble is at
below 5000 ft and fine weather. I am flying off my 40 hours (22 so far) and
am only flying in good weather. These radio problems at a Class C airport
have made me afraid to fly. ATC could take some action against me if it
continues.
Lancair has an all carbon Legacy available but this one is all fiberglass
with the exception of the horizontal stabilizer, which is carbon. The
antenna is inside the fuselage about 4+feet forward of the stabilizer.
The bottom and rear half of the plane is in primer. The rest of the plane
is bare fiberglass. The primer ends just about at the location of the
antenna on the fuselage. I don't know if this would have an effect on the
static on the plane or not. I would have had to consider static wicks a
long time earlier in the build in order to install bonding wire. It is too
late now AFAIK.
Bill B
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Thursday, January 19, 2012 9:10 AM
Subject: Re: AeroElectric-List: Re: Weak and Static on Transmission
<nuckolls.bob@aeroelectric.com>
At 10:18 PM 1/18/2012, you wrote:
<kellym@aviating.com>
>
>I'm surprised no one has brought up the obvious
>of likely P-static. Does the aircraft have any static wicks?
He didn't mention flying in precip and static
wicks don't have anything to 'connect' to on
a glass airplane. If it's a carbon fiber then
wicks might be useful but my impression was that
his poor signal reports were at low altitudes
and probably slowed down for approach to landing
and in clear weather. P-static wouldn't hurt
a transmitted signal, only a received signal and
he didn't mention not being able to hear . . .
only be heard.
This is why the differentiation between weak-signal
static versus poor connection static is important.
The presence of carbon would support the notion of
it being the weak-signal variety.
Bob . . .
Message 10
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| Subject: | really cheap relay deck; was 28 to 12v down-converter |
The same ebay company had this:
http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=250975404341#ht_4310wt_1398
<http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=250975404341#ht_4310wt_1398>
Looks like it would be an economical alternative to the high dollar
relay decks used with stick grip switches, etc. The relay coils are 5V,
but a handful of dropping resistors or a 5V supply feeding the control
switches would solve that.
Charlie
On 01/22/2012 09:47 AM, Robert L. Nuckolls, III wrote:
> A short time ago we were discussing options for
> adding some 12-14 accessories to a 28v airplane.
> I think the author of the thread was also interested
> in having some 'cigar lighter' jacks for the odd
> appliance.
>
> Here's a device I ran across on eBay . . .
>
> *http://tinyurl.com/7phxaoy*
>
> Of course there are bumps and potholes in the translation
> of specifications into English but for the most part, this
> device seems a likely candidate. It features both
> output voltage and current limit adjustments. This makes
> it suitable for the task and even somewhat idiot proof
> in that it's self protecting in case of a short circuit
> or overload.
>
> Of course, compatibility with respect to radio noise is
> unknown but I've never met a noise problem I couldn't
> whip.
>
> Food for thought.
>
> Bob . . .
>
Message 11
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| Subject: | Re: Weak and Static on Transmission |
Bob,
I have borrowed an ICOM A6 handheld that I could use to do the sniffing you
are describing, but I cant use it to transmit in the plane. It seems that
the A6 comes with a headset adapter, but if you don't also buy the optional
PTT adapter as well, both mics will be open at the same time.
Do you suggest a good value handheld radio? I need to buy one, but I am
concerned with the type of "gotchas" that ICOM seems to have. It also will
not transmit they tell me if the external power is plugged in.
During this probing you describe, I should have everything in the panel
turned on for the first pass, then if I get a response, start turning
everything off one at a time till I find what causes the response??
This includes the radio??
Bill B
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Sunday, January 22, 2012 10:52 AM
Subject: RE: AeroElectric-List: Re: Weak and Static on Transmission
<nuckolls.bob@aeroelectric.com>
At 07:38 AM 1/20/2012, you wrote:
><bbradburry@bellsouth.net>
>
>Well, to further clarify this problem. I seem to be able to hear ok on the
>ground while taxiing around the airport, but after I leave the airport the
>reception gets really bad. At first I thought it was a problem with the
>approach frequency because that is where it would first start up. It was a
>loud hiss in the headphones so loud that I could not hear ATC. In fact, I
>have made two NORDO landings as a result on this loud hiss. I sent my
radio
>back to have it checked out and nothing was found. All this trouble is at
>below 5000 ft and fine weather. I am flying off my 40 hours (22 so far)
and
>am only flying in good weather. These radio problems at a Class C airport
>have made me afraid to fly. ATC could take some action against me if it
>continues.
This is the first time I've been aware that you were having
problems both with hearing and talking. While the ground
listeners complain of "static" you have described the extraneous
audio as a "hiss". We may be talking of two different problems.
I'm having trouble resolving a single noise source that would
manifest in both what you hear and what is transmitted to the
ground.
Get a hand-held transceiver and use it to 'probe' around
the airplane. Use tune the hand-held to an unused frequency,
open the squelch and open the volume to get a low level of
no-signal hiss common to all receivers. Then probe around
the panel mounted goodies and wire harnesses with the
hand-held's antenna. See if the no-signal hiss changes
in level with the master switch on versus off. If it does
change, turn off accessories and/or pull breakers/fuses to
see if any one accessory produces a noticeable change
in noise from the hand-held.
You can use the hand-held as an airborne signal quality
sniffer too. Use a headset with the hand held to listen
to your own transmitted signals. You may have to take the
antenna off the hand-held to avoid overloading the hand-held
receiver. You don't need to talk on the ship's radio, just
listen to your transmitted signal to characterize the noise.
Is it the same "hiss" you hear in your received signals?
In any case, carry the hand held to avoid the no-radio
return to the airport. In fact, having the 'three musketeers
of dark-panel ops' in your flight bag is good insurance
for any flights:
www.aeroelectric.com/Pictures/Misc/Failure_Tolerance.pdf
It was also suggested that you try a substitute antenna.
I've fabricated test antennas that could be taped to the
top or bottom surface of a wing and coax brought into
the cockpit through the door gasket or some other pathway.
But using the hand-held to characterize your transmitted
and received signals personally takes ATC and others
out of the loop. This is an especially good thing when
they're unable/unwilling to join the discussion and
offer their own observations/insights.
Bob . . .
Message 12
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| Subject: | Re: 28 to 12v down-converter |
Seems like isolating the input ground and output ground could be
difficult in some situations... manageable to isolate the lighter
socket, but if, for instance, you're running an audio device that you
want to connect to music-in on the intercom, oh oh!
Paul
On 1/22/2012 7:47 AM, Robert L. Nuckolls, III wrote:
> A short time ago we were discussing options for
> adding some 12-14 accessories to a 28v airplane.
> I think the author of the thread was also interested
> in having some 'cigar lighter' jacks for the odd
> appliance.
>
> Here's a device I ran across on eBay . . .
>
> *http://tinyurl.com/7phxaoy*
>
> Of course there are bumps and potholes in the translation
> of specifications into English but for the most part, this
> device seems a likely candidate. It features both
> output voltage and current limit adjustments. This makes
> it suitable for the task and even somewhat idiot proof
> in that it's self protecting in case of a short circuit
> or overload.
>
> Of course, compatibility with respect to radio noise is
> unknown but I've never met a noise problem I couldn't
> whip.
>
> Food for thought.
>
> Bob . . .
>
> *
>
>
> *
--
Please note my new email address!
millner@me.com
Message 13
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| Subject: | Re: Weak and Static on Transmission |
The adapter you describe is simply a NO (normally open) momentary switch
connected to a 1/8 in mono jack. Both mikes only open if you push the PTT
switch on the radio.
Noel
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Bill
Bradburry
Sent: January 22, 2012 4:26 PM
Subject: RE: AeroElectric-List: Re: Weak and Static on Transmission
<bbradburry@bellsouth.net>
Bob,
I have borrowed an ICOM A6 handheld that I could use to do the sniffing you
are describing, but I cant use it to transmit in the plane. It seems that
the A6 comes with a headset adapter, but if you don't also buy the optional
PTT adapter as well, both mics will be open at the same time.
Do you suggest a good value handheld radio? I need to buy one, but I am
concerned with the type of "gotchas" that ICOM seems to have. It also will
not transmit they tell me if the external power is plugged in.
During this probing you describe, I should have everything in the panel
turned on for the first pass, then if I get a response, start turning
everything off one at a time till I find what causes the response??
This includes the radio??
Bill B
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Sunday, January 22, 2012 10:52 AM
Subject: RE: AeroElectric-List: Re: Weak and Static on Transmission
<nuckolls.bob@aeroelectric.com>
At 07:38 AM 1/20/2012, you wrote:
><bbradburry@bellsouth.net>
>
>Well, to further clarify this problem. I seem to be able to hear ok on the
>ground while taxiing around the airport, but after I leave the airport the
>reception gets really bad. At first I thought it was a problem with the
>approach frequency because that is where it would first start up. It was a
>loud hiss in the headphones so loud that I could not hear ATC. In fact, I
>have made two NORDO landings as a result on this loud hiss. I sent my
radio
>back to have it checked out and nothing was found. All this trouble is at
>below 5000 ft and fine weather. I am flying off my 40 hours (22 so far)
and
>am only flying in good weather. These radio problems at a Class C airport
>have made me afraid to fly. ATC could take some action against me if it
>continues.
This is the first time I've been aware that you were having
problems both with hearing and talking. While the ground
listeners complain of "static" you have described the extraneous
audio as a "hiss". We may be talking of two different problems.
I'm having trouble resolving a single noise source that would
manifest in both what you hear and what is transmitted to the
ground.
Get a hand-held transceiver and use it to 'probe' around
the airplane. Use tune the hand-held to an unused frequency,
open the squelch and open the volume to get a low level of
no-signal hiss common to all receivers. Then probe around
the panel mounted goodies and wire harnesses with the
hand-held's antenna. See if the no-signal hiss changes
in level with the master switch on versus off. If it does
change, turn off accessories and/or pull breakers/fuses to
see if any one accessory produces a noticeable change
in noise from the hand-held.
You can use the hand-held as an airborne signal quality
sniffer too. Use a headset with the hand held to listen
to your own transmitted signals. You may have to take the
antenna off the hand-held to avoid overloading the hand-held
receiver. You don't need to talk on the ship's radio, just
listen to your transmitted signal to characterize the noise.
Is it the same "hiss" you hear in your received signals?
In any case, carry the hand held to avoid the no-radio
return to the airport. In fact, having the 'three musketeers
of dark-panel ops' in your flight bag is good insurance
for any flights:
www.aeroelectric.com/Pictures/Misc/Failure_Tolerance.pdf
It was also suggested that you try a substitute antenna.
I've fabricated test antennas that could be taped to the
top or bottom surface of a wing and coax brought into
the cockpit through the door gasket or some other pathway.
But using the hand-held to characterize your transmitted
and received signals personally takes ATC and others
out of the loop. This is an especially good thing when
they're unable/unwilling to join the discussion and
offer their own observations/insights.
Bob . . .
Message 14
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| Subject: | Re: Weak and Static on Transmission |
I wonder why the handheld mike is not turned off when the headset adapter is
plugged in? That would solve the problem and you wouldn't need to buy an
"optional" part so that it will work.
I haven't noticed much of a problem with receiving when I am on the ground.
It also seems better when I get close to the airport and contact the tower.
At first, I thought the problem was with approach/departure freq because
that was where I had the most trouble.
Bill B
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Noel
Loveys
Sent: Sunday, January 22, 2012 5:12 PM
Subject: RE: AeroElectric-List: Re: Weak and Static on Transmission
The adapter you describe is simply a NO (normally open) momentary switch
connected to a 1/8 in mono jack. Both mikes only open if you push the PTT
switch on the radio.
Noel
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Bill
Bradburry
Sent: January 22, 2012 4:26 PM
Subject: RE: AeroElectric-List: Re: Weak and Static on Transmission
<bbradburry@bellsouth.net>
Bob,
I have borrowed an ICOM A6 handheld that I could use to do the sniffing you
are describing, but I cant use it to transmit in the plane. It seems that
the A6 comes with a headset adapter, but if you don't also buy the optional
PTT adapter as well, both mics will be open at the same time.
Do you suggest a good value handheld radio? I need to buy one, but I am
concerned with the type of "gotchas" that ICOM seems to have. It also will
not transmit they tell me if the external power is plugged in.
During this probing you describe, I should have everything in the panel
turned on for the first pass, then if I get a response, start turning
everything off one at a time till I find what causes the response??
This includes the radio??
Bill B
-----Original Message-----
From: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] On Behalf Of Robert L.
Nuckolls, III
Sent: Sunday, January 22, 2012 10:52 AM
Subject: RE: AeroElectric-List: Re: Weak and Static on Transmission
<nuckolls.bob@aeroelectric.com>
At 07:38 AM 1/20/2012, you wrote:
><bbradburry@bellsouth.net>
>
>Well, to further clarify this problem. I seem to be able to hear ok on the
>ground while taxiing around the airport, but after I leave the airport the
>reception gets really bad. At first I thought it was a problem with the
>approach frequency because that is where it would first start up. It was a
>loud hiss in the headphones so loud that I could not hear ATC. In fact, I
>have made two NORDO landings as a result on this loud hiss. I sent my
radio
>back to have it checked out and nothing was found. All this trouble is at
>below 5000 ft and fine weather. I am flying off my 40 hours (22 so far)
and
>am only flying in good weather. These radio problems at a Class C airport
>have made me afraid to fly. ATC could take some action against me if it
>continues.
This is the first time I've been aware that you were having
problems both with hearing and talking. While the ground
listeners complain of "static" you have described the extraneous
audio as a "hiss". We may be talking of two different problems.
I'm having trouble resolving a single noise source that would
manifest in both what you hear and what is transmitted to the
ground.
Get a hand-held transceiver and use it to 'probe' around
the airplane. Use tune the hand-held to an unused frequency,
open the squelch and open the volume to get a low level of
no-signal hiss common to all receivers. Then probe around
the panel mounted goodies and wire harnesses with the
hand-held's antenna. See if the no-signal hiss changes
in level with the master switch on versus off. If it does
change, turn off accessories and/or pull breakers/fuses to
see if any one accessory produces a noticeable change
in noise from the hand-held.
You can use the hand-held as an airborne signal quality
sniffer too. Use a headset with the hand held to listen
to your own transmitted signals. You may have to take the
antenna off the hand-held to avoid overloading the hand-held
receiver. You don't need to talk on the ship's radio, just
listen to your transmitted signal to characterize the noise.
Is it the same "hiss" you hear in your received signals?
In any case, carry the hand held to avoid the no-radio
return to the airport. In fact, having the 'three musketeers
of dark-panel ops' in your flight bag is good insurance
for any flights:
www.aeroelectric.com/Pictures/Misc/Failure_Tolerance.pdf
It was also suggested that you try a substitute antenna.
I've fabricated test antennas that could be taped to the
top or bottom surface of a wing and coax brought into
the cockpit through the door gasket or some other pathway.
But using the hand-held to characterize your transmitted
and received signals personally takes ATC and others
out of the loop. This is an especially good thing when
they're unable/unwilling to join the discussion and
offer their own observations/insights.
Bob . . .
Message 15
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| Subject: | Re: Grand rapids cs02 / cs01 amp sensor |
bob
what size wire did you use??
and was it a CS01 or a 02?
Chris
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=364553#364553
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